Lost: Via Domus Question and Answers :

Where is the dynamite

where is the dynamite

You need to go through the left hand waterfall opposite the swan hatch entrance. Check out
the wall and the Elliot will say something like "hmm, I need some dynamite" then you can
go to the Black Rock to fetch some. watch out for Cerberus when you are on your way back
to the swan it's easily the most annoying section of the game and I am yet to pas it so
far (tried for about 8 mi***es yesterday got bored)